When photographing birds, wildlife, sports or action, mobility can make the difference between nailing the shot or missing it altogether. The AF-S NIKKOR 500mm f/5.6E PF ED VR is a fraction of the size of most full-frame 500mm lenses, freeing you to be as nimble as your subjects. For nearly two centuries, Fresnel lenses were used in lighthouses to project a strong beam of light. By harnessing the idea in reversefor gathering light instead of projecting itNikon engineers can create lenses that are shorter and lighter, with the same image quality and zoom power of much larger lenses. When combined with Nikons Extra-low Dispersion (ED) glass and other NIKKOR glass elements, the Phase Fresnel element produces high resolution, high contrast images with beautiful background blur. Lighter, more compact optics dont just benefit your mobilitya lighter focus lens group allows the autofocus system to focus faster, too. With the AF-S NIKKOR 500mm f/5.6E PF ED VR, Nikons Silent Wave Motor (SWM) is able to operate at peak performance for fast, quiet autofocus.